Espeleologia (1987)

CEAE-LPN - Espeleologia
The underground environment is completely dark, but in this particularly irregular environment one can progress in narrow places where the body can barely pass, or in spaces where several 4 or 5-storey buildings could be aligned. So one of the additional problems for filming was lighting.
A história da primeira série didática produzida em Portugal sobre o ensino e a prática da Espeleologia.